Feat: Reworked ENTIRE Project for Readability

src/core/ui/idle.ts

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+import { store } from "@store/state.svelte";
+
+const IDLE_EVENTS = ["mousemove", "mousedown", "keydown", "touchstart", "wheel"] as const;
+
+export function mountIdleDetection(onIdle: () => void, onActive: () => void): () => void {
+  let timer: ReturnType<typeof setTimeout> | null = null;
+
+  function reset() {
+    if (timer) clearTimeout(timer);
+    const ms = (store.settings.idleTimeoutMin ?? 5) * 60 * 1000;
+    if (ms === 0) return;
+    timer = setTimeout(onIdle, ms);
+    onActive();
+  }
+
+  IDLE_EVENTS.forEach(e => window.addEventListener(e, reset, { passive: true }));
+  reset();
+
+  return () => {
+    if (timer) clearTimeout(timer);
+    IDLE_EVENTS.forEach(e => window.removeEventListener(e, reset));
+  };
+}

src/core/ui/index.ts

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+export * from './idle';
+export * from './zoom';

src/core/ui/zoom.ts

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+import { store } from "@store/state.svelte";
+
+let _appliedZoom: number = -1;
+let _vhRafId: number | null = null;
+
+export function applyZoom() {
+  const uiZoom = store.settings.uiZoom ?? 1.0;
+  if (uiZoom === _appliedZoom) return;
+  _appliedZoom = uiZoom;
+
+  document.documentElement.style.setProperty("--ui-zoom", String(uiZoom));
+  document.documentElement.style.setProperty("--ui-scale", String(uiZoom));
+  document.documentElement.style.zoom = `${uiZoom * 100}%`;
+
+  if (_vhRafId !== null) cancelAnimationFrame(_vhRafId);
+  _vhRafId = requestAnimationFrame(() => {
+    _vhRafId = null;
+    document.documentElement.style.setProperty("--visual-vh", `${window.innerHeight / uiZoom}px`);
+  });
+}
+
+export function handleZoomKey(e: KeyboardEvent) {
+  if (!e.ctrlKey) return;
+  const current = store.settings.uiZoom ?? 1.0;
+  if (e.key === "=" || e.key === "+") {
+    e.preventDefault();
+    store.settings.uiZoom = Math.min(2.0, Math.round((current + 0.1) * 10) / 10);
+  } else if (e.key === "-") {
+    e.preventDefault();
+    store.settings.uiZoom = Math.max(0.5, Math.round((current - 0.1) * 10) / 10);
+  } else if (e.key === "0") {
+    e.preventDefault();
+    store.settings.uiZoom = 1.0;
+  }
+}
+
+export function mountZoomKey(): () => void {
+  window.addEventListener("keydown", handleZoomKey);
+  return () => window.removeEventListener("keydown", handleZoomKey);
+}